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Siemens BL series 40A two-pole bolt-on breaker with toggle actuator

SIEMENS

SIEMENS B240 BL Series 40A 2 Pole 120/240V AC Circuit Breaker

SKU CH-4DWS-92FCJ

A 40 A two-pole breaker rated 120/240 V AC with 10 kA interrupting capacity for Siemens P1 panels

  • 40 A rating protects 120/240 V circuits reliably
  • 10 kA interrupting capacity handles fault currents safely
  • Bolt-on mounting fits Siemens P1 panelboards directly
  • Two-pole design controls both legs of single-phase supply
  • Lug terminals accept wire down to 8 AWG

SIEMENS BL Series 40 A Two-Pole Breaker

This SIEMENS BL Series miniature circuit breaker provides 40 A overload and short-circuit protection on a 120/240 V AC single-phase supply. It mounts by bolting onto compatible Siemens P1 panelboards and uses a toggle actuator for manual switching. The unit carries a 10 kA interrupting rating at its rated voltage and accepts conductors down to 8 AWG at its lug terminals.

For Siemens P1 panelboard installations needing

Electricians fitting or extending a Siemens P1 load centre will find this breaker matches the required frame size and mounting method. It is not suited for panels that accept only plug-on breakers or for systems requiring a DC voltage rating, and it cannot be used where a higher interrupting capacity is specified.

10 kA interrupting rating at 120/240 V AC

The 10 kA AIR rating is the single figure that determines whether this breaker can safely clear a fault in your installation. Verify that the available fault current at the panelboard does not exceed this value before selecting the device.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $97.99
Pricier than about 68% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

Does the breaker come with mounting hardware or lugs, or must they be ordered separately?

The unit uses bolt-on mounting and a terminal lug connection; both are integral to the breaker so no separate hardware is required.

Should I select a different ampere rating or pole count for my load center?

This model is fixed at 40 A, 2 pole, 120/240 V AC; choose it only when the circuit requires exactly that rating and your panel is a Siemens P1 series.

What does the 10 kA interrupting rating mean when the breaker is installed in a panel?

It means the breaker can safely clear a fault current up to 10 kA at 120/240 V AC without damage, provided the panel’s available fault current does not exceed that value.

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